Light passes successively through two polarimeters tubes each of length 0.29m. The first tube contains dextro rotatory solution of concentration 60kgm^–3 and specific rotation 0.01rad m²kg^–1. The second tube contains laevo rotatory solution of concentration 30kg/m³ and specific rotation 0.02 radm²kg^–1. The net rotation produced is

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20°

15°

10°

0°

answer is B.

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Detailed Solution

Rotation produced $θ = slc$

Net rotation produced $θ_{r} = θ_{1} - θ_{2} = l (S_{1} C_{1} - S_{2} C_{2})$

$= 0 .29 \times [0 .01 \times 60 - 0 .02 \times 30] = 0$

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